From: Stanislav Kinsbursky <skinsbursky@parallels.com>
Date: Fri, 25 May 2012 14:38:50 +0000 (+0400)
Subject: NFSd: fix locking in nfsd_forget_delegations()
X-Git-Tag: v3.6-rc1~35^2~21
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a6d88f293ecd1b7444e128777f4a893e7a998852;p=pandora-kernel.git

NFSd: fix locking in nfsd_forget_delegations()

This patch adds recall_lock hold to nfsd_forget_delegations() to protect
nfsd_process_n_delegations() call.
Also, looks like it would be better to collect delegations to some local
on-stack list, and then unhash collected list. This split allows to
simplify locking, because delegation traversing is protected by recall_lock,
when delegation unhash is protected by client_mutex.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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